TWI635008B - Axle box supporting device of trolley for railway vehicles and manufacturing method thereof - Google Patents

Abstract

The axle beam of the axle box supporting device of the trolley for railway vehicles has an axle beam end portion which is provided at the front end of the axle beam body portion extending from the axle box along the vehicle length direction and formed with openings on both sides in the vehicle width direction The cylindrical part. The cylindrical portion includes a first semi-cylindrical portion formed integrally with the main body of the axle beam, a second semi-cylindrical portion overlapping the first semi-cylindrical portion from the vehicle longitudinal direction side, and a second semi-cylindrical portion at the vehicle length Bolt tightened to the first half cylinder direction. The first half-cylinder portion includes a flat opposing surface that is in surface contact with the second half-cylinder portion, and a hole that extends in a direction orthogonal to the opposing surface and into which the bolt is inserted. The second half-cylinder portion includes: a flat opposing surface that is in surface contact with the opposing surface of the first half-cylinder portion, a flat processing reference surface formed on the opposite side of the opposing surface, and orthogonal to the opposing surface A hole extending in the direction of the bolt and through which the bolt is inserted.

Description

Axle box supporting device of trolley for railway vehicles and manufacturing method thereof

The invention relates to an axle box supporting device of a trolley for railway vehicles and a manufacturing method thereof.

In a trolley for a railway vehicle, an axle box accommodating a bearing that rotatably supports an axle is supported by a trolley frame via an axle box support device. For example, the trolley shown in Patent Document 1 discloses an axle-beam type axle box support device in which the axle box is supported by a side beam of the trolley frame via an axle beam integrally formed with the axle box and extending in the vehicle longitudinal direction .

In Patent Document 1, a cylindrical portion that is open on both sides in the vehicle width direction is formed at one end in the vehicle longitudinal direction of the axle beam connected to the side beam. The cylindrical portion is inserted into the mandrel through a rubber bush, and both ends of the mandrel protruding from both sides of the cylindrical portion in the vehicle width direction are fitted into the groove portion of the receiving seat provided in the trolley frame. In order to insert the rubber bush and the mandrel, the cylindrical portion of the axle beam is divided in the longitudinal direction of the vehicle with the dividing line extending in the vertical direction as a boundary. The cylindrical portion is composed of a first semi-cylindrical portion formed integrally with the shaft beam, and a second semi-cylindrical portion fastened to the first semi-cylindrical portion with bolts and nuts.

When the second half-cylinder part can be fastened to the first half-cylinder part formed integrally with the axle beam, it is necessary to machine the second half-cylinder part. Specifically, in addition to the step of improving the flatness of the alignment surface of the second half-cylinder portion and the first half-cylinder portion, a step of forming an insertion hole for inserting a bolt, and performing Steps to improve the flatness of the seat surface in contact with the head of the bolt.

[Prior Technical Literature]

[Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open No. 2015-107773

However, in the step of forming the insertion hole through which the bolt is inserted, it is necessary to form the insertion hole with good accuracy, and therefore it is necessary to stably install the second half-cylinder portion in the processing device. Here, since the second half-cylinder part has a semicircular shape, in order to be able to stably place the alignment surface with the flat first half-cylinder part on the stationary plate of the processing device, it is necessary As the alignment surface of the machined surface, it is directed to the upper side with high precision and held with a jig or the like, and then the second half-cylinder portion is reversed for replacement.

Therefore, the object of the present invention is to reduce the number of machining steps required for the second half-cylinder part to be fastened to the first half-cylinder part formed integrally with the axle beam in the axle box supporting device of the railway vehicle trolley number.

An axle box support device for a trolley for a railway vehicle according to one aspect of the present invention includes an axle beam, an axle beam body portion extending from the axle box housing a bearing supporting the axle in the vehicle longitudinal direction, and the axle beam body provided on the axle beam body The front end of the part and the end of the axle beam that forms the cylindrical portion that is open on both sides in the vehicle width direction; the mandrel is inserted into the inner space of the cylindrical portion in the vehicle width direction; the elastic bush is interposed in the cylindrical shape Between the part and the mandrel; and a bearing seat, which is provided on the trolley frame and connected to both ends of the mandrel, and the cylindrical part is provided with: a first semi-cylindrical part integrally formed on the shaft beam body part , The second half cylinder that coincides with the first half cylinder portion from the longitudinal side of the vehicle And a bolt that fastens the second half-cylinder portion to the first half-cylinder portion in the vehicle longitudinal direction; the first half-cylinder portion includes: a flat opposing surface that makes surface contact with the second half-cylinder portion , And a hole extending in a direction orthogonal to the opposite surface and through which the bolt is inserted, the second half-cylinder portion includes: a flat opposite surface in surface contact with the opposite surface of the first half-cylinder portion A surface, a flat processing reference surface formed on the opposite side of the opposed surface, and a hole extending in a direction orthogonal to the opposed surface and through which the bolt is inserted.

According to the above configuration, by providing the processing reference plane in the second half-cylinder portion, the second half-cylinder portion can be stably placed on the fixed plate of the processing device, and the process and formation of the opposing surface can be performed with high accuracy Hole steps. In addition, when performing the above two steps, there is no need to perform a replacement operation for reversing the posture of the second half-cylinder portion, so the workability is improved.

A method of manufacturing an axle box support device for a trolley for railway vehicles according to one aspect of the present invention is used to manufacture an axle box support device. The axle box support device includes an axle beam having an axle box that self-accommodates a bearing that supports the axle An axle beam body portion extending in the longitudinal direction of the vehicle, and an axle beam end portion provided at the front end of the axle beam body portion and formed with cylindrical portions that are open on both sides in the vehicle width direction, the cylindrical portion including: integrally formed in The first half-cylinder portion of the shaft beam body portion coincides with the second half-cylinder portion of the first half-cylinder portion, and a bolt that fastens the second half-cylinder portion to the first half-cylinder portion, the manufacturing method Equipped with: a facing surface processing step, the second half-cylinder portion is provided on the processing device in a state where the flat processing reference surface in the second half-cylinder portion is in contact with the stationary plate of the processing device, and the facing surface Plane processing, the flat processing reference surface is formed on the opposite side of the flat opposing surface that is in surface contact with the first half-cylinder portion; and the hole forming step is in the same setting posture as the above opposing surface processing step Form supply Said bolt inserted through the second hole of the semi-cylindrical portion.

According to the above method, by providing the processing reference plane in the second half-cylinder portion, the second half-cylinder portion can be stably placed on the fixed plate of the processing device, and the opposite surface processing step and the hole formation can be performed with high precision Steps. In addition, when performing the above two steps, there is no need to perform a replacement operation for reversing the posture of the second half-cylinder portion, so the workability is improved. Furthermore, the inner peripheral surface of the cylindrical portion is subjected to perfect circular processing with the second semi-cylindrical portion overlapping the first semi-cylindrical portion. The elastic bush inserted into the cylindrical portion is fastened.

According to the present invention, in the axle box supporting device of the trolley for railway vehicles, the number of work steps required for mechanical processing for fastening to the second half cylinder part of the first half cylinder part formed integrally with the axle beam can be reduced.

1. 201‧‧‧Trolley for railway vehicles

6‧‧‧axle

8‧‧‧bearing

10‧‧‧axle box

16, 216‧‧‧ Axle box support device

21‧‧‧axle beam

22, 222‧‧‧ undertake seat

23‧‧‧Rubber bushing (elastic bushing)

23c‧‧‧Perimeter

23d‧‧‧recess

24‧‧‧mandrel

25‧‧‧Cylinder

25c‧‧‧Inner peripheral surface

26‧‧‧First half cylinder

26a‧‧‧ Opposite

26b‧‧‧Drilling (hole)

26c‧‧‧Inner peripheral surface

27‧‧‧The second half cylinder

27a‧‧‧ Opposite

27b‧‧‧Screw hole (hole)

27d‧‧‧Processing datum

28‧‧‧bolt

29‧‧‧Locating pin

41‧‧‧Shaft beam body

42‧‧‧End of shaft beam

50‧‧‧Processing device

50a‧‧‧fixed plate

S‧‧‧Internal space

FIG. 1 is a side view of the trolley for railway vehicles according to the first embodiment.

FIG. 2 is an enlarged side view of the periphery of the axle beam of the axle box support device shown in FIG. 1. FIG.

Fig. 3 is an exploded side view of the cylindrical portion of the shaft beam shown in Fig. 2.

Fig. 4 is a sectional view taken along line IV-IV of Fig. 2.

FIG. 5 is a diagram illustrating the manufacturing procedure of the cylindrical portion of the axle beam in the method of manufacturing the axle box support device shown in FIG. 2.

FIG. 6 is a diagram illustrating a manufacturing procedure of a cylindrical portion of an axle beam in a conventional manufacturing method of an axle box supporting device.

Fig. 7 is a side view of a trolley for railway vehicles according to a second embodiment.

Hereinafter, the embodiments will be described with reference to the drawings. In addition, the same or corresponding elements are affixed with the same symbols in all figures, and repeated detailed description is omitted.

(First embodiment)

Fig. 1 is a side view of the trolley 1 for railway vehicles according to the first embodiment. As shown in FIG. 1, a trolley for railway vehicles (hereinafter referred to as a trolley) 1 includes a trolley frame 3 connected to a vehicle body 30 via an air spring 2. The trolley frame 3 includes a cross member 4 extending in the vehicle width direction at the center of the trolley 1 in the vehicle length direction, and side beams 5 extending in the vehicle length direction from both ends of the cross member 4 in the vehicle width direction.

On both sides of the vehicle frame 3 in the vehicle length direction, axles 6 extending in the vehicle width direction are respectively arranged. The wheel 7 is pressed into both sides of the axle 6 in the vehicle width direction. The axle 6 and the wheels 7 constitute an axle 15. In addition, a pair of wheel shafts 15 provided on the trolley 1 are disposed on both sides of the trolley frame 3 in the longitudinal direction of the vehicle. At the ends of both sides of the axle 6 in the vehicle width direction, a bearing 8 that rotatably supports the wheel 7 at the outer side in the vehicle width direction relative to the wheel 7 is provided. The bearing 8 is accommodated in the axle box 10.

The axle box 10 is elastically connected to the trolley frame 3 via the axle box support device 16. The axle box support device 16 includes an axle spring 20 that connects the axle box 10 and the longitudinal end 5a of the side beam 5 in the vehicle longitudinal direction, and an axle beam that connects the axle box 10 and the side beam 5 in the longitudinal direction of the vehicle twenty one. The axle beam 21 is integrally formed with the axle box 10 and extends in the vehicle longitudinal direction. At the front end of the axle beam 21, cylindrical portions 25 (see FIG. 2) that are open on both sides in the vehicle width direction are formed. The mandrel 24 is inserted into the internal space S of the cylindrical portion 25 via the elastic bush 23 (see FIG. 4).

Furthermore, the side beam 5 is provided with a pair of receiving seats 22, and is connected to the shaft beam 21 via the elastic bush 23 and the mandrel 24. Specifically, the receiving seat 22 protrudes downward from the lower surface 5b of the side beam 5, and the mandrel 24 is fitted into the groove portion 22a provided in the receiving seat 22 (see FIG. 4). In this state, the cover member 18 is fixed to the cover member 18 with bolts 19 so as to close the lower opening of the groove portion a The socket 22 allows the mandrel 24 to be clamped between the socket 22 and the cover member 18. In this way, the mandrel 24 is connected to the receiving seat 22.

2 is an enlarged side view of the periphery of the axle beam 21 of the axle box support device 16 shown in FIG. FIG. 3 is an exploded side view of the cylindrical portion 25 of the shaft beam 21 shown in FIG. 2. In addition, in FIGS. 2 and 3, for convenience of explanation, illustrations of the shaft spring 20, the rubber bush 23, the mandrel 24, the receiving seat 22, and the cover member 18 are omitted. As shown in FIGS. 2 and 3, the axle beam 21 has an axle beam body portion 41 and an axle beam end portion 42 formed with a cylindrical portion 25. The axle beam body portion 41 includes a pair of side plate portions 41a extending in the vehicle longitudinal direction, and a connecting plate portion 41b (see FIG. 4) connecting the pair of side plate portions 41a in the vehicle width direction. Thus, the axle beam body 41 has a cross-sectional shape that is substantially H-shaped as viewed in the vehicle longitudinal direction.

The cylindrical portion 25 of the axle beam end 42 is divided into a first half cylinder portion 26 integrally formed on the axle beam body portion 41 and a second half cylinder overlapping the first half cylinder portion 26 from the vehicle longitudinal outer side部 27. In addition, the second half cylinder portion 27 is fixed to the first half cylinder portion 26 with a plurality of bolts 28. With this configuration, a cylindrical inner space S through which the rubber bush 23 and the mandrel 24 are inserted is formed.

The bolt 28 is inserted from the first half cylinder portion 26 side toward the second half cylinder portion 27. Here, when the bolt 28 is inserted from the first half-cylinder portion 26, in order to prevent the bolt 28 from interfering with the side plate portion 41a of the beam main body 41, the upper edge of the side plate portion 41a is gentle when viewed from the side Curve shape (bow shape). Specifically, at least one half of the upper edge of the side plate portion 41a on the side of the first half-cylinder portion 26 is formed so as not to overlap the axis of the upper bolt 28 in the up-down direction. In addition, the lower edge of the side plate portion 41a extends from the axle box 10 in parallel with the horizontal line so as not to overlap the axis of the lower bolt 28 in the up-down direction.

The first half cylinder part 26 and the second half cylinder part 27 are made by casting or forging The metal material (for example, carbon steel) is formed by mechanical processing. The first half-cylinder portion 26 includes a flat facing surface 26a and a hole 26b extending in a direction orthogonal to the facing surface 26a (vehicle longitudinal direction). The facing surface 26a comes into surface contact with the facing surface 27a of the second half cylinder portion 27. The bolt 28 is inserted in the hole 26b. Here, the hole 26b is a drilled hole and penetrates the first half cylinder portion 26 in the vehicle longitudinal direction.

The second half cylinder portion 27 includes a flat opposing surface 27a, a hole 27b extending in a direction orthogonal to the opposing surface 27a (vehicle longitudinal direction), and a flat processing reference surface formed on the opposite side of the opposing surface 27a 27d, and further surrounds the intermediate surface 27e between the opposing surface 27a and the machining reference surface 27d. The opposing surface 27a is in surface contact with the opposing surface 26a of the first half cylinder portion 26. A bolt 28 is inserted in the hole 27b. Here, the hole 27b is a screw hole in which a female screw is formed on the inner peripheral surface, and the first half cylinder portion 26 and the second half cylinder portion 27 are fixed by bolts 28.

The intermediate surface 27e is a surface that constitutes a recessed portion 27f formed by recessing the outer surface of the second half-cylinder portion 27 toward the opposing surface 27a. Specifically, the intermediate surface 27e overlaps with the opposing surface 27a as viewed in the vehicle longitudinal direction. Moreover, the screw hole 27b penetrates from the opposing surface 27a to the intermediate surface 27e. Moreover, the front end of the bolt 28 inserted into the screw hole 27b is located directly in front of the intermediate surface 27e. In addition, the front end of the bolt 28 may be on the same plane or protrude with respect to the intermediate surface 27e.

Here, the intermediate surface 27e is provided from the viewpoint of commonality and weight reduction with components of a conventional structure. As will be described later, the conventional cylindrical portion 125 is for the bolt 128 to be inserted from the second half-cylinder portion 127 side toward the first half-cylinder portion 126 (see FIG. 6 (e)). The second half cylinder portion 127 of the prior art is provided with a seating surface for the head of the bolt 128 to contact. This seating surface corresponds to the middle surface 27e of this embodiment. Therefore, the cylindrical portion 25 of the present embodiment is different from the conventional cylindrical portion 125 in the direction in which the bolt 28 is inserted, but by providing the intermediate surface 27e, the bolt can be inserted even from the same direction as before Composition. Moreover, the intermediate surface 27e and the recess 27f are also The second half-cylinder portion 27 is formed to be lightweight. In addition, in the cylindrical portion 25 of this embodiment, the intermediate surface 27e and the recess 27f may not be formed.

4 is a cross-sectional view taken along line IV-IV shown in FIG. 2. As described above, the core shaft 24 connects the axle beam 21 and the side beam 5 and, as shown in FIG. 4, is inserted into the cylindrical portion 25 in the vehicle width direction. The mandrel 24 has a cylindrical portion 24a, a pair of conical flange portions 24b, and a protruding end portion 24c. An elastic bush 23 is interposed between the cylindrical portion 25 and the mandrel 24. In this embodiment, the elastic bush 23 is a rubber bush.

The rubber bush 23 has a cylindrical portion 23 a and a pair of flange portions 23 b protruding outward in the radial direction, and is fitted on the mandrel 24. Moreover, when the rubber bush 23 is inserted into the cylindrical portion 25, the inner peripheral surface 25c of the cylindrical portion 25 (the inner peripheral surface 26c of the first half cylindrical portion 26 and the inner peripheral surface of the second half cylindrical portion 27 27c) while tightening. Here, since the rubber bush 23 is designed to have anisotropy with respect to elastic characteristics, the elastic properties of the rubber bush 23 are also different if the position where the cylindrical portion 25 is inserted is not determined. Therefore, in order to match the elastic characteristics of the rubber bush 23 to the design, it is necessary to position the rubber bush 23 to the cylindrical portion 25.

Therefore, in this embodiment, since the positioning pin 29 is provided in the first half cylinder portion 26, the rubber bush 23 is positioned to the cylinder portion 25. The positioning pin 29 is fixed to the pin hole 26d provided in the inner peripheral surface 26c of the first half cylinder portion 26.

On the outer peripheral surface 23c of the cylindrical portion 23a of the rubber bush 23, a concave portion 23d recessed radially inward is formed. The protruding portion of the positioning pin 29 from the pin hole 26d is engaged with the concave portion 23d of the rubber bush 23, whereby the rubber bush 23 cannot rotate around the center O of the cylindrical portion 25. Thus, the rubber bush 23 is positioned relative to the cylindrical portion 25.

The manufacturing process of the axle box support device 16 configured as above will be described.

FIG. 5 is a diagram for explaining the manufacturing procedure of the cylindrical portion 25 of the axle beam 21 in the method of manufacturing the axle box supporting device 16 shown in FIG. 2. First, the original of the second half-cylinder portion 27 formed by casting or forging is prepared. Then, as shown in FIG. 5 (a), the processing reference plane 27 d in the original shape of the second half-cylinder portion 27 is placed on the fixed plate 50 a, and the second half-cylinder portion 27 is installed in the processing device 50. Here, the processing device 50 is, for example, a processing center that performs a plurality of processing operations one by one with an automatic conversion function of tools. Then, in a state where the second half-cylinder portion 27 is provided in the processing device 50, an opposing surface processing step of performing planar processing of the opposing surface 27a and a screw hole forming step of forming the screw hole 27b are performed. Therefore, the posture of the second half-cylinder portion 27 provided in the processing device 50 when the screw hole forming step is performed is the same as the facing surface processing step.

Next, the first half-cylinder portion 26 formed integrally with the shaft beam body portion 41 is prepared, and the facing surface processing step for planarly processing the facing surface 26a and the hole forming step for forming the hole 26b (not shown) ).

Thereafter, as shown in FIG. 5 (b), the facing surface 27a of the second half-cylinder portion 27 processed in FIG. 5 (a) is brought into surface contact with the facing surface 26a of the first half-cylinder portion 26 . At this time, the first half cylinder portion 26 and the second half cylinder portion 27 are fixed by temporary bolts (not shown).

Then, in a state where the first half-cylinder portion 26 and the second half-cylinder portion 27 are overlapped and fixed, the cylindrical portion 25 is subjected to an inner peripheral surface processing step. Specifically, perfect circular processing is performed so that the inner peripheral surface 25c of the cylindrical portion 25 has a perfect circular shape when viewed from the vehicle width direction. Thereby, the rubber bush 23 inserted into the cylindrical portion 25 can be fastened satisfactorily by the inner peripheral surface 25c that has been subjected to perfect circle processing.

When the inner peripheral surface processing step is completed, only the first half-cylinder portion 26 is retained in the processing device, and a pin hole forming step of forming a pin hole 26d into which the positioning pin 29 is inserted in the inner peripheral surface 26c is performed. That is, in the pin hole forming step, only the inner peripheral surface 26c of the first half cylinder portion 26 is processed, and The inner peripheral surface 27c of the second half tube portion 27 is not processed. In addition, the pin hole forming step may also be performed during the opposite surface processing step of the first half cylinder portion 26 described above. When the pin hole forming step for the first half-cylinder portion 26 is completed, the processing for the cylindrical portion 25 is completed.

Next, the rubber bush 23 is brought into contact with the inner peripheral surface 26c of the first half-cylinder portion 26, so that the recess 23d of the rubber bush 23 is engaged with the positioning pin 29 provided in the first half-cylinder portion 26. Then, the rubber bush 23 is brought into contact with the inner peripheral surface 27c of the second half cylinder 27, and the rubber bush 23 is sandwiched between the first half cylinder 26 and the second half cylinder 27.

Finally, the opposing surfaces 26 a and 27 a of the first and second half-cylinder portions 26 and 27 are brought into contact with each other and fixed with bolts 28. In this way, the axle box support device 16 is formed.

Here, for comparison of the manufacturing methods of the present embodiment, a conventional manufacturing method of the axle box support device will be described.

FIG. 6 is a diagram for explaining the manufacturing procedure of the cylindrical portion 125 of the axle beam 121 in the conventional manufacturing method of the axle box supporting device 116. The difference between the conventional cylindrical portion 125 and the cylindrical portion 25 of this embodiment will be described below. FIG. 6 (a) shows the original of the second half-cylinder portion 127 formed by casting or forging. The second half-cylinder portion 127 is formed in a semicircular shape, and only an arc-shaped surface is formed on the opposite side of the opposing surface 127a . Therefore, unlike this embodiment, a flat processing reference surface is not formed in the second half-cylinder portion 127. Therefore, in the case of performing planar processing on the opposing surface 127a, in order to stably install the second half-cylinder portion 127 in the processing device, it is necessary to support the second half-cylinder portion 127 by another structure.

Next, as shown in FIG. 6 (b), the second half-cylinder portion 127 is reversed, and the second half-cylinder portion 127 is installed in the processing device so that the facing surface 127 a on which the plane processing is performed faces downward. Then, a hole forming step for forming a hole 127b through which the bolt 128 is inserted, and forming and Machining step of the hole 128 of the seat surface 127e that the head 128a of the bolt 128 contacts.

In this way, in order to process the drilled hole 127b with high accuracy and perform plane processing on the seating surface 127e with high accuracy, the operation of reversing the second half-cylinder portion 127 is required.

Next, as shown in FIG. 6 (c), the first half-cylinder portion 126 and the second half-cylinder portion 127 are superposed on the processing device, and the inner circumferential surface 125c of the cylindrical portion 125 is processed in a perfect circle . Thereafter, of the first half-cylinder portion 126 and the second half-cylinder portion 127 that have been subjected to perfect circle processing, only the second half-cylinder portion 127 is provided in the processing device, and a pin hole 127d is formed on the inner peripheral surface 127c.

Finally, the first half-cylinder portion 126 and the second half-cylinder portion 127 thus formed are brought into contact with each other to be fixed by the bolt 128 and the nut 131.

In this way, in the manufacture of the conventional axle box support device 116, in addition to the opposite surface processing step and the drilling forming step, the operation step of the mechanical processing of the second half-cylinder portion 127 also requires a hole processing step and a pin hole Formation steps. In addition, since multiple replacement operations occur, many steps are generated.

The axle box supporting device 16 of the trolley 1 for railway vehicles configured as described above achieves the following effects.

Since the processing reference surface 27d is provided in the second half-cylinder portion 27, the second half-cylinder portion 27 can be stably placed on the fixed plate 50a of the processing device 50, so that the opposite surface processing step and Screw hole processing steps. In addition, when performing the above two steps, there is no need to perform a replacement operation for reversing the posture of the second half-cylinder portion 27, so the workability is improved.

In addition, since the hole 27b of the second half-cylinder portion 27 is tapped, a nut is not required to fix the first half-cylinder portion 26 and the second half-cylinder portion 27, and no hole drilling is required.

Furthermore, by attaching the positioning pin 29 of the rubber bush 23 to the first half cylinder part 26. Compared with the conventional structure mounted on the second half-cylinder portion 127, the number of operation steps required for the mechanical processing of the second half-cylinder portion 27 can be further reduced.

(Second embodiment)

7 is a side view of the trolley 201 of the second embodiment. The trolley 201 of the second embodiment is obtained by partially changing the structure of the trolley frame 3 and the like compared to the trolley 1 of the first embodiment. Hereinafter, the trolley 201 of the second embodiment will be described in terms of differences from the trolley 1 of the first embodiment.

As shown in FIG. 7, the carriage frame 203 is provided with a beam 204 extending in the vehicle width direction at the center in the vehicle length direction of the carriage 201, but unlike the structure of the carriage frame 3 of the first embodiment, it does not include The side beams at both ends 204a in the vehicle width direction extend in the vehicle longitudinal direction. At both end portions 204a of the cross beam 204 in the vehicle width direction, a pair of receiving seats 222 constituting an axle box support device 216 protrudes outward in the vehicle longitudinal direction. Furthermore, the receiving seat 222 and the cover member 18 clamp the mandrel 24 of the cylindrical portion 25 in the shaft beam 21.

In addition, a leaf spring 209 extending in the longitudinal direction of the vehicle is installed between the axle box 210 and the cross member 204. The leaf spring 209 supports the vehicle width direction ends 204a of the cross member 204 from below at the vehicle longitudinal center portion 209a, and the vehicle length direction end 209b of the leaf spring 209 is supported by the axle box 210. That is, the leaf spring 209 has the function of the shaft spring 20 (primary suspension) of the first embodiment and the side beam 5 of the first embodiment.

The vehicle longitudinal end 209b of the plate spring 209 is supported by the axle box 210 from below via the support member 231. The support member 231 is provided above the axle box 210. In addition, the support member 231 has a receiving member 232 and a vibration-proof rubber 233. The receiving member 232 has a generally rectangular shape in plan view, a bottom wall portion that supports the lower surface of the plate spring 209, and a vehicle from the bottom wall portion Both ends of the vehicle in the longitudinal direction project upward to the outer wall portion. The upper surface of the support member 231 is inclined obliquely downward toward the center side in the vehicle longitudinal direction. In addition, the upper surface of the support member 231 may not be inclined as long as it is substantially parallel to the lower surface of the vehicle longitudinal end 209b of the plate spring 209.

The anti-vibration rubber 233 has a substantially cylindrical shape, and is inserted between the axle box 210 and the receiving member 232. The axle box 210 has a spring seat 210a including an upper surface in surface contact with the lower surface of the anti-vibration rubber 233. The upper surface of the spring seat 210a is also substantially parallel to the lower surface of the plate spring 209, and is inclined obliquely downward toward the center side in the vehicle longitudinal direction. Other configurations are the same as in the first embodiment.

The second embodiment described above can also obtain the same effect as the first embodiment. That is, the axle box support device 216 including the second semi-cylindrical portion 27 having the flat processing reference surface 27d as in the first embodiment is not limited to the trolley 1 provided with the general trolley frame 3, and can also be used. Trolley 201 of leaf spring 209.

In addition, the present invention is not limited to the above-mentioned embodiment, and its configuration can be changed, added, or deleted without departing from the gist of the present invention. The above embodiments can be arbitrarily combined with each other. For example, a part of the configuration or method in one embodiment can be applied to other embodiments. In addition, a part of the configuration in the embodiment can be arbitrarily extracted separately from other configurations in the embodiment. In the above embodiment, the cylindrical portion 25 is divided in the longitudinal direction of the vehicle, but it may be divided in the vertical direction. Moreover, the positioning pin 29 may be attached to the cylindrical portion 25 in plural numbers, that is, plural pin holes 26d are provided at arbitrary positions on the inner peripheral surface 26c of the first half cylindrical portion 26 based on the virtual line VL.

Claims (5)

An axle box support device for a trolley for a railway vehicle includes an axle beam, an axle beam body portion extending from a axle box housing a bearing supporting the axle in the longitudinal direction of the vehicle, and a front end provided at the front end of the axle beam body portion and A shaft beam end formed with a cylindrical portion that is open on both sides in the vehicle width direction; a mandrel inserted into the inner space of the cylindrical portion in the vehicle width direction; an elastic bush interposed between the cylindrical portion and the core Between the shafts; and the bearing seats, which are provided on the trolley frame and connected to both ends of the mandrel, the cylindrical portion is provided with: a first semi-cylindrical portion integrally formed on the body portion of the axle beam, from the length of the vehicle The direction side coincides with the second half-cylinder portion of the first half-cylinder portion, and the bolt that fastens the second half-cylinder portion to the first half-cylinder portion in the vehicle length direction; the first half-cylinder portion includes: A flat opposing surface that is in surface contact with the second semi-cylindrical portion, and a hole extending in a direction orthogonal to the opposing surface and through which the bolt is inserted, the second semi-cylindrical portion includes: The flat opposing surface that is in surface contact with the above opposing surface of the half cylinder portion, To the reference plane in the machining of the flat surface of the opposite side of it, extends above and along a direction orthogonal to the opposing faces of the bolt and the hole for the insertion. For example, the axle box support device of the trolley for railway vehicles according to the first item of the patent scope, wherein the hole of the first half-cylinder portion is a drilled hole, the hole of the second half-cylinder portion is a screw hole, and the bolt is from the above The first half cylinder part is inserted into the hole toward the second half cylinder part. For example, the axle box supporting device of the trolley for railway vehicles according to item 1 or 2 of the patent scope further includes a positioning pin, which is mounted on the cylindrical portion and engaged with the elastic bush, and is formed on the outer peripheral surface of the elastic bush There is a recess for engaging the pin, and the pin is mounted on the inner circumferential surface of the first half-cylinder part. A method for manufacturing an axle box support device for a trolley for a railway vehicle is used to manufacture an axle box support device. The axle box support device includes an axle beam having an axle box extending from the axle box in which a bearing supporting the axle is accommodated. An axle beam body portion and an axle beam end portion provided at a front end of the axle beam body portion and formed with cylindrical portions that are open on both sides in the vehicle width direction, the cylindrical portion includes: integrally formed on the axle beam body portion The first half-cylinder part overlaps the second half-cylinder part of the first half-cylinder part, and the bolt that fastens the second half-cylinder part to the first half-cylinder part, the manufacturing method includes: an opposite surface In the processing step, the second half-cylinder portion is set in the processing device in a state where the flat processing reference surface in the second half-cylinder portion is in contact with the fixed plate of the processing device, and the opposite surface is planar-processed. The flat processing reference surface is formed on the opposite side of the flat opposing surface that is in surface contact with the first half-cylinder portion; the hole forming step is formed in the same posture as the above opposing surface processing step for the bolt to pass through 2nd above The cylindrical bore portion; and an inner circumferential surface of the processing step, so that the second semi-cylindrical portion coincides with the above-described state of the first semi-cylindrical portion on the inner circumferential surface of the cylindrical portion of the processing for a perfect circle. For example, the method for manufacturing the axle box supporting device of the trolley for railway vehicles according to claim 4, wherein the hole forming step is a screw hole forming step for forming a screw hole through which the bolt is inserted, and the bolt The cylindrical portion is inserted toward the second semi-cylindrical portion.